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| # | Species | Formula |
| 1653 | Perfluoroheptane | C7F16 | |
| 1654 | cis-Perfluorobicyclo[4,3,0]nonane | C9F16 | |
| 1655 | trans-Perfluorobicyclo[4,3,0]nonane | C9F16 | |
| 1656 | Perfluoro 3-ethyl 2,4 dimethyl pent-2-en | C9F18 | |
| 1657 | Perfluoro cis decalin | C10F18 | |
| 1658 | Perfluoro-di(n-butyl) ether | C8OF18 | |
| 1659 | Perfluoro-2,7-dimethyloctane | C10F22 | |
| 1660 | Perfluorotributylamine | C12NF27 | |
| 1661 | Neon, atom | Ne | |
| 1662 | Neon fluoride anion (Geo) | FNe | |
| 1663 | Sodium, cation | Na | |
| 1664 | Sodium, 2P(u) - 3s(0)3p(1) | Na | |
| 1665 | Sodium, atom | Na | |
| 1666 | Sodium, anion | Na | |
| 1667 | Sodium hydride (Geo) | HNa | |
| 1668 | Sodium hydride | HNa | |
| 1669 | Helium Sodium cation (Geo) | HeNa | |
| 1670 | Na-Li, complex (Geo) | LiNa | |
| 1671 | Sodium lithium | LiNa | |
| 1672 | Sodium methyl (Geo) | CH3Na | |
| 1673 | Sodium cyclopentadienide (Geo) | C5H5Na | |
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